/**
 * Tests for public health check endpoints
 *
 * These tests verify the logic and format of health check responses
 * without starting a full server.
 */

import { describe, it, expect } from 'bun:test';

describe('Health Check Endpoint Logic', () => {
  describe('/healthz response format', () => {
    it('should have correct structure with status and timestamp', () => {
      // Simulate /healthz response
      const response = {
        status: 'ok',
        timestamp: new Date().toISOString(),
      };

      expect(response).toHaveProperty('status', 'ok');
      expect(response).toHaveProperty('timestamp');
      expect(typeof response.timestamp).toBe('string');

      // Verify timestamp is valid ISO string
      expect(() => new Date(response.timestamp)).not.toThrow();
      expect(response.timestamp).toMatch(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}/);
    });

    it('should always return 200 status', () => {
      // /healthz always returns ok
      const statusCode = 200;
      expect(statusCode).toBe(200);
    });
  });

  describe('/health response format', () => {
    it('should return DEGRADED status when no agents are running', () => {
      const agents: any[] = [];
      const isHealthy = agents.length > 0;

      const healthcheck = {
        status: isHealthy ? 'OK' : 'DEGRADED',
        version: process.env.APP_VERSION || 'unknown',
        timestamp: new Date().toISOString(),
        dependencies: {
          agents: isHealthy ? 'healthy' : 'no_agents',
        },
        agentCount: agents.length,
      };

      const statusCode = isHealthy ? 200 : 503;

      expect(statusCode).toBe(503);
      expect(healthcheck.status).toBe('DEGRADED');
      expect(healthcheck.agentCount).toBe(0);
      expect(healthcheck.dependencies.agents).toBe('no_agents');
    });

    it('should return OK status when agents are running', () => {
      const agents = [{ id: '123' }]; // Mock agent
      const isHealthy = agents.length > 0;

      const healthcheck = {
        status: isHealthy ? 'OK' : 'DEGRADED',
        version: process.env.APP_VERSION || 'unknown',
        timestamp: new Date().toISOString(),
        dependencies: {
          agents: isHealthy ? 'healthy' : 'no_agents',
        },
        agentCount: agents.length,
      };

      const statusCode = isHealthy ? 200 : 503;

      expect(statusCode).toBe(200);
      expect(healthcheck.status).toBe('OK');
      expect(healthcheck.agentCount).toBe(1);
      expect(healthcheck.dependencies.agents).toBe('healthy');
    });

    it('should have consistent format with /api/server/health', () => {
      const agents: any[] = [];
      const isHealthy = agents.length > 0;

      const healthcheck = {
        status: isHealthy ? 'OK' : 'DEGRADED',
        version: process.env.APP_VERSION || 'unknown',
        timestamp: new Date().toISOString(),
        dependencies: {
          agents: isHealthy ? 'healthy' : 'no_agents',
        },
        agentCount: agents.length,
      };

      // Verify all expected fields are present
      expect(healthcheck).toHaveProperty('status');
      expect(healthcheck).toHaveProperty('version');
      expect(healthcheck).toHaveProperty('timestamp');
      expect(healthcheck).toHaveProperty('dependencies');
      expect(healthcheck).toHaveProperty('agentCount');

      // Verify field types
      expect(typeof healthcheck.status).toBe('string');
      expect(typeof healthcheck.version).toBe('string');
      expect(typeof healthcheck.timestamp).toBe('string');
      expect(typeof healthcheck.dependencies).toBe('object');
      expect(typeof healthcheck.agentCount).toBe('number');

      // Verify timestamp is ISO format (matches /api/server/health format)
      expect(healthcheck.timestamp).toMatch(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}/);
    });

    it('should include version field', () => {
      const agents: any[] = [];
      const isHealthy = agents.length > 0;

      const healthcheck = {
        status: isHealthy ? 'OK' : 'DEGRADED',
        version: process.env.APP_VERSION || 'unknown',
        timestamp: new Date().toISOString(),
        dependencies: {
          agents: isHealthy ? 'healthy' : 'no_agents',
        },
        agentCount: agents.length,
      };

      expect(healthcheck).toHaveProperty('version');
      expect(typeof healthcheck.version).toBe('string');
    });

    it('should include dependencies object with agents status', () => {
      const agents: any[] = [];
      const isHealthy = agents.length > 0;

      const healthcheck = {
        status: isHealthy ? 'OK' : 'DEGRADED',
        version: process.env.APP_VERSION || 'unknown',
        timestamp: new Date().toISOString(),
        dependencies: {
          agents: isHealthy ? 'healthy' : 'no_agents',
        },
        agentCount: agents.length,
      };

      expect(healthcheck).toHaveProperty('dependencies');
      expect(healthcheck.dependencies).toHaveProperty('agents');
      expect(['healthy', 'no_agents']).toContain(healthcheck.dependencies.agents);
    });
  });

  describe('Rate Limiting Configuration', () => {
    it('should have correct rate limit settings', () => {
      const rateLimitConfig = {
        windowMs: 60 * 1000, // 1 minute
        max: 100, // 100 requests per minute
        message: 'Too many health check requests from this IP, please try again later.',
        standardHeaders: true,
        legacyHeaders: false,
      };

      expect(rateLimitConfig.windowMs).toBe(60000);
      expect(rateLimitConfig.max).toBe(100);
      expect(rateLimitConfig.standardHeaders).toBe(true);
      expect(rateLimitConfig.legacyHeaders).toBe(false);
    });

    it('should skip rate limiting for internal IPs', () => {
      const skipRateLimiting = (ip: string): boolean => {
        return (
          ip === '127.0.0.1' ||
          ip === '::1' ||
          ip.startsWith('10.') ||
          ip.startsWith('172.') ||
          ip.startsWith('192.168.')
        );
      };

      // Internal IPs should skip rate limiting
      expect(skipRateLimiting('127.0.0.1')).toBe(true);
      expect(skipRateLimiting('::1')).toBe(true);
      expect(skipRateLimiting('10.0.0.1')).toBe(true);
      expect(skipRateLimiting('172.16.0.1')).toBe(true);
      expect(skipRateLimiting('192.168.1.1')).toBe(true);

      // External IPs should not skip
      expect(skipRateLimiting('8.8.8.8')).toBe(false);
      expect(skipRateLimiting('1.1.1.1')).toBe(false);
    });
  });

  describe('Response Status Codes', () => {
    it('should return 200 for /healthz always', () => {
      const statusCode = 200;
      expect(statusCode).toBe(200);
    });

    it('should return 200 when agents are healthy', () => {
      const agents = [{ id: '123' }];
      const statusCode = agents.length > 0 ? 200 : 503;
      expect(statusCode).toBe(200);
    });

    it('should return 503 when no agents are running', () => {
      const agents: any[] = [];
      const statusCode = agents.length > 0 ? 200 : 503;
      expect(statusCode).toBe(503);
    });
  });
});
